Combine first 5 ingredients; beat at medium speed of electric mixer 30 seconds.
Combine flour, sugar, baking powder, soda, and salt in a large bowl; make a well in center of mixture.
Add egg mixture, stirring just until moistened.
Fold in blueberries and walnuts.
Pour batter into a greased and floured 9- x 5- x 3-inch loaf pan; bake at 350° for 1 hour or until a wooden pick inserted in center comes out clean.
Cool in pan 10 minutes; remove from pan, and cool completely.